Abstract:

The cycle of field tracer monitoring is about 150-360 days. Therefore it should not identify water-flood swept area after the cycle of tracer monitoring. And it fails to effectively solve these problems that preferable water-injection direction and advancing speed of two sets of oil layers and the identification of the direction of water (injection-water or edge-water). Introducing the tracer simulation technology, and giving full consideration to the impact of the phenomenon of tracer fluid mass, based on historical performance match and the monitor result match of tracer fluid, water-flooding front and edge-water advancing were studied. The results show that tracer simulation results is basically consistent with the field tracer monitoring results. Numerical model can be used to conduct a longer period monitoring to compensate for the disadvantage of the complex of construction and time-consuming monitoring cycle, and so on. The water-flooding front, water-flood swept area, advancing speed and the preferable water injection direction can be simulated with numerical model, further to evaluate and predict the injection-production flow laws of two sets of reservoirs, it can provide reliable foundation to deploy reasonable flood pattern, to develop remain oil and ultimately enhance oil recovery.

Key words: edge-water reservoir, water-flooding front, tracer numerical simulation, dual step horizontal well, oil fields